This function enables the user to flip certain regions of binder to change the binder to a desired shape, as illustrated in Figure 6.2.60.
Figure 6.2.60 Butterfly interface
l CONTROL LINES
This function is used to list the added control lines information. Select an arbitrary control line in the list by cursor and double click on the left mouse button. The program will automatically display the corresponding serial numbers for all control lines for the user to identify the serial number of control lines in the list. Therefore, the user can select this serial number to perform edit and delete operations.
l ADD
This function allows the user to add control lines on binder. Click on this button and select two points on binder to generate a control line. The program will simultaneously pop up a 2D window, as shown in Figure 6.2.61. In this 2D window, it will display the section line on the control line and the part section line cut by the section line. The user can change the binder by editing the section line so that the binder will be more suitable for the part.
Figure 6.2.61 Butterfly 2D Window
l EDIT
This function allows the user to edit control lines. Select the control lines to be edited in Control Lines list and the 2D window appears. The user can change the parameters in this window to re-edit the flipped region of the binder.
l REMOVE
This function allows the user to remove the unnecessary control lines and restore the flipped regions on binder simultaneously.
The functions for 2D window are described below.
The user can change the shape of part section line cut by the section line on control line via moving the slider. The user can enter the FOLD value and click on ENTER key to set the angle between the section line on control line and the binder, or drag the endpoint of section line by moving the cursor up and down to control the size of the control angle. The user can enter the RADIUS value and click on ENTER key to set the radius of transition surface for the flipped region of binder, or directly drag the circle by cursor to control the radius. Click on SWAP button to change the direction of section line, as shown in Figure 6.2.62(b). The user can drag the endpoint of section line to change the cutting range of it by clicking on EDIT button.
(a) (b)
Figure 6.2.62 Edit Section Line